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Instance Members
Instance Methods & this
Intializers & final Values

Consider the class Circle:

import java.lang.Math;

public class Circle
{
    // Accessor methods
    public double getX()      { return m_x; }
    public double getY()      { return m_y; }
    public double getRadius() { return m_r; }

    // Mutator methods
    public void setX(double v)      { m_x = v; }
    public void setY(double v)      { m_y = v; }
    public void setRadius(double r) { m_r = r; }

    // Operations/Attributes
    public double getCircumference()
                { return 2 * Math.PI * m_r; }
    public double getArea()
                { return Math.PI * m_r*m_r; }

    // Data
    double m_x, m_y; // coordinates of center
    double m_r; // radius
}

Circle has a number of members:

• member variables, data members, or fields
  • m_x,  m_y, and m_r
• member functions, or methods
  • accessor methods:
    • double getX()
    • double getY()
    • double getRadius()
  • mutator methods:
    • void setX(double v)
    • void setY(double v)
    • void setRadius(double r)
  • other methods:
    • double getCircumference()
    • double getArea()

Question: Are getCircumference() and getArea() operations or accessor methods??

This page was last modified on 02 October, 2007